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Complex III of the electron transport chain contains as many as 11 subunits per monomer. In this opening structure it is shown with 9. Show orientation within the inner mitochondrial membrane with labels. Coloring one subunit grey reveals that one of the peptides of each subunit invades the space of the other subunit. Three of the subunits of each monomeric unit have a direct role in the passage of electrons in the respiratory chain. The subunits that are colored are active in the electron transport chain. The interior spaces which are created by the positions of the other subunits have a role in the movement of the substrates from one active site to another, and these peptides have other catalytic activities.